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Original question:

[FAQ] TPS25750: How do I create a Sink-Only USB-C PD port to replace a legacy Barrel Jack Connector?

TPS25750: Create a 100W Source Only Port to replace a traditional 2 wire terminal block

Devesh Agarwal
Prodigy 90 points
Part Number: TPS25750
Other Parts Discussed in Thread: TPD2S300, TPS65987D,

We make a complete POE board solution. Output 20V up to 5A. Output DC connection is via a two wire terminal block. I would like to replace the terminal block and create a USB-C 100W (20V 5A) souce only output instead. This will have to be a low component count, and low-cost design.

1.

Would TPS25750D be a suitable? Or is another product recommended?

2.

Can I request for a suggested schematic.

3.

Should I use the TPD2S300 protection IC considering its only a source port?

4.

How can I prevent damage to my board from someone plugging in a USB C source? Will the TPS25750D prevent it?

Thanks in advance.

  • 0
    TI__Genius 12665 points

    Hi Devesh,

    Let me check with my team and get back to you on your first 2 queries.

    For query 3: Yes, you should still use the TPD2S300 for CC line OVP protection. Since you will be sourcing 20V on VBUS, if somehow VBUS pin accidentally gets shorted with CC pin (at the connector or elsewhere), the CC pins of the PD controller will become damaged because they are not rated for 20V. The TPD2S300 acts as a protection device to avoid this.

    For query 4: You will be able to configure the PD controller to be source only with no sink power paths and no configured sink PD contracts. As a result, the internal power path switches in the PD controller will not enable when a far-end source device is plugged in and furthermore, no sink PD contract will be negotiated. It will not be possible for explicit PD power to be sourced from the far-end to your board.

    I will update you further on queries 1 and 2.

    Best,

    Alex

  • 0
    TI__Genius 12665 points

    Hi Devesh,

    For query 1: I would recommend TPS65987D. The TPS25750 will require you to use both power paths to source, one power path for initial 5V, second power path to switch to for 20V 5A. With TPS65987D, you would be able to keep everything on one integrated power path. Both devices can accomplish what you are trying to do.

    For query 2: While we don't have an exact recommended schematic for your source-only power-only application, here are a few resources that could be helpful to you:

    TPS65987/88 Hardware Design Guideline

    PD Source Design with TPS65987 and TPS55288

    TPS65987EVM_Schematic.PDF

    The first two resources are design guidelines for TPS65987D. The third resource is a schematic of our TPS65987EVM available on ti.com. This schematic has an integrated source path and necessary related circuitry that could be useful.

    Please let me know if you have further questions.

    Best,

    Alex